diff options
Diffstat (limited to 'net/rxrpc/conn_service.c')
| -rw-r--r-- | net/rxrpc/conn_service.c | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/net/rxrpc/conn_service.c b/net/rxrpc/conn_service.c new file mode 100644 index 0000000000..89ac05a711 --- /dev/null +++ b/net/rxrpc/conn_service.c @@ -0,0 +1,194 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* Service connection management + * + * Copyright (C) 2016 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + */ + +#include <linux/slab.h> +#include "ar-internal.h" + +/* + * Find a service connection under RCU conditions. + * + * We could use a hash table, but that is subject to bucket stuffing by an + * attacker as the client gets to pick the epoch and cid values and would know + * the hash function. So, instead, we use a hash table for the peer and from + * that an rbtree to find the service connection. Under ordinary circumstances + * it might be slower than a large hash table, but it is at least limited in + * depth. + */ +struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *peer, + struct sk_buff *skb) +{ + struct rxrpc_connection *conn = NULL; + struct rxrpc_conn_proto k; + struct rxrpc_skb_priv *sp = rxrpc_skb(skb); + struct rb_node *p; + unsigned int seq = 0; + + k.epoch = sp->hdr.epoch; + k.cid = sp->hdr.cid & RXRPC_CIDMASK; + + do { + /* Unfortunately, rbtree walking doesn't give reliable results + * under just the RCU read lock, so we have to check for + * changes. + */ + read_seqbegin_or_lock(&peer->service_conn_lock, &seq); + + p = rcu_dereference_raw(peer->service_conns.rb_node); + while (p) { + conn = rb_entry(p, struct rxrpc_connection, service_node); + + if (conn->proto.index_key < k.index_key) + p = rcu_dereference_raw(p->rb_left); + else if (conn->proto.index_key > k.index_key) + p = rcu_dereference_raw(p->rb_right); + else + break; + conn = NULL; + } + } while (need_seqretry(&peer->service_conn_lock, seq)); + + done_seqretry(&peer->service_conn_lock, seq); + _leave(" = %d", conn ? conn->debug_id : -1); + return conn; +} + +/* + * Insert a service connection into a peer's tree, thereby making it a target + * for incoming packets. + */ +static void rxrpc_publish_service_conn(struct rxrpc_peer *peer, + struct rxrpc_connection *conn) +{ + struct rxrpc_connection *cursor = NULL; + struct rxrpc_conn_proto k = conn->proto; + struct rb_node **pp, *parent; + + write_seqlock(&peer->service_conn_lock); + + pp = &peer->service_conns.rb_node; + parent = NULL; + while (*pp) { + parent = *pp; + cursor = rb_entry(parent, + struct rxrpc_connection, service_node); + + if (cursor->proto.index_key < k.index_key) + pp = &(*pp)->rb_left; + else if (cursor->proto.index_key > k.index_key) + pp = &(*pp)->rb_right; + else + goto found_extant_conn; + } + + rb_link_node_rcu(&conn->service_node, parent, pp); + rb_insert_color(&conn->service_node, &peer->service_conns); +conn_published: + set_bit(RXRPC_CONN_IN_SERVICE_CONNS, &conn->flags); + write_sequnlock(&peer->service_conn_lock); + _leave(" = %d [new]", conn->debug_id); + return; + +found_extant_conn: + if (refcount_read(&cursor->ref) == 0) + goto replace_old_connection; + write_sequnlock(&peer->service_conn_lock); + /* We should not be able to get here. rxrpc_incoming_connection() is + * called in a non-reentrant context, so there can't be a race to + * insert a new connection. + */ + BUG(); + +replace_old_connection: + /* The old connection is from an outdated epoch. */ + _debug("replace conn"); + rb_replace_node_rcu(&cursor->service_node, + &conn->service_node, + &peer->service_conns); + clear_bit(RXRPC_CONN_IN_SERVICE_CONNS, &cursor->flags); + goto conn_published; +} + +/* + * Preallocate a service connection. The connection is placed on the proc and + * reap lists so that we don't have to get the lock from BH context. + */ +struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *rxnet, + gfp_t gfp) +{ + struct rxrpc_connection *conn = rxrpc_alloc_connection(rxnet, gfp); + + if (conn) { + /* We maintain an extra ref on the connection whilst it is on + * the rxrpc_connections list. + */ + conn->state = RXRPC_CONN_SERVICE_PREALLOC; + refcount_set(&conn->ref, 2); + + atomic_inc(&rxnet->nr_conns); + write_lock(&rxnet->conn_lock); + list_add_tail(&conn->link, &rxnet->service_conns); + list_add_tail(&conn->proc_link, &rxnet->conn_proc_list); + write_unlock(&rxnet->conn_lock); + + rxrpc_see_connection(conn, rxrpc_conn_new_service); + } + + return conn; +} + +/* + * Set up an incoming connection. This is called in BH context with the RCU + * read lock held. + */ +void rxrpc_new_incoming_connection(struct rxrpc_sock *rx, + struct rxrpc_connection *conn, + const struct rxrpc_security *sec, + struct sk_buff *skb) +{ + struct rxrpc_skb_priv *sp = rxrpc_skb(skb); + + _enter(""); + + conn->proto.epoch = sp->hdr.epoch; + conn->proto.cid = sp->hdr.cid & RXRPC_CIDMASK; + conn->orig_service_id = sp->hdr.serviceId; + conn->service_id = sp->hdr.serviceId; + conn->security_ix = sp->hdr.securityIndex; + conn->out_clientflag = 0; + conn->security = sec; + if (conn->security_ix) + conn->state = RXRPC_CONN_SERVICE_UNSECURED; + else + conn->state = RXRPC_CONN_SERVICE; + + /* See if we should upgrade the service. This can only happen on the + * first packet on a new connection. Once done, it applies to all + * subsequent calls on that connection. + */ + if (sp->hdr.userStatus == RXRPC_USERSTATUS_SERVICE_UPGRADE && + conn->service_id == rx->service_upgrade.from) + conn->service_id = rx->service_upgrade.to; + + atomic_set(&conn->active, 1); + + /* Make the connection a target for incoming packets. */ + rxrpc_publish_service_conn(conn->peer, conn); +} + +/* + * Remove the service connection from the peer's tree, thereby removing it as a + * target for incoming packets. + */ +void rxrpc_unpublish_service_conn(struct rxrpc_connection *conn) +{ + struct rxrpc_peer *peer = conn->peer; + + write_seqlock(&peer->service_conn_lock); + if (test_and_clear_bit(RXRPC_CONN_IN_SERVICE_CONNS, &conn->flags)) + rb_erase(&conn->service_node, &peer->service_conns); + write_sequnlock(&peer->service_conn_lock); +} |